Y'know, I think it would be very interesting to answer the question of whether the observed gender gap in ability in the hard sciences is due to genetics or some other factor.
However it's a damn-near-impossible to do decent research on this question. There are only two possible answers, A and B, but if your results show A then you'll be lauded and become the subject of approving articles like this one, and if your results show B then you'll be condemned and possibly hounded out of your job like Larry Summers. When there's such an incentive to get the socially-approved answer rather than the scientifically correct answer, lousy research tends to proliferate.
However it's a damn-near-impossible to do decent research on this question. There are only two possible answers, A and B, but if your results show A then you'll be lauded and become the subject of approving articles like this one, and if your results show B then you'll be condemned and possibly hounded out of your job like Larry Summers. When there's such an incentive to get the socially-approved answer rather than the scientifically correct answer, lousy research tends to proliferate.